Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1f837bd4c25a697…

MALICIOUS

PDF

81.8 KB Created: 2021-09-03 16:55:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7fbe1e348cec74a0dc51fd2bcd005afb SHA-1: bc92cc3e0840f66bfe7417d2a0c76d77992c7b85 SHA-256: f1f837bd4c25a69745f430e704ab94ed2f7535d89918baa55d717cf611193afd
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits characteristics of a phishing or malware distribution lure, evidenced by numerous links pointing to compromised CMS uploads and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for delivering a second-stage payload or redirecting users to malicious sites. No scripts were extracted, but the extensive link farm suggests a broad phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://synerhu.ru/uplcv?utm_term=leicaflex+sl+mot+manual PDF link annotation
    • http://rollfactorytogo.com/uploads/files/1980521232.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/fifimumazikotusuxazap.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/c6ad66d05369ee585e843a7946bcbf6b/49163204184.pdfIn PDF document text
    • http://oishisushigd.com/uploads/files/56796806905.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/truk13rv6ei6blqf09413d6rfk/7270751023.pdfIn PDF document text
    • http://magogaralbamoble.com/galeria/files/2243831485.pdfIn PDF document text
    • http://mextro.de/upload/files/44707897597.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/33721336951.pdfIn PDF document text
    • https://dm288.rs/slicice/file/pimanibigexavebegaliliva.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca3bb03cd1---filifub.pdfIn PDF document text
    • https://gamedunyasi.com/calisma2/files/uploads/87553051083.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094bd835f044---87403698695.pdfIn PDF document text
    • https://ambulatorioveterinariosismondi.eu/file/74624873213.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d9828d3d8a2---85170411941.pdfIn PDF document text
    • http://cafehinglung.com/uploads/files/negadiwekezi.pdfIn PDF document text
    • http://dermalab.pl/userfiles/file/sumusibeba.pdfIn PDF document text
    • http://ctkupavna.ru/upload/file/42841174445.pdfIn PDF document text
    • http://lev-steklo.ru/userfiles/file/fufidije.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a19294e74c7---lerowalegubibu.pdfIn PDF document text
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/22901271604.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d7082706598---36939506339.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609456a5a5e7b---romaxesogasolide.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a1b30a9e85d---42239199347.pdfIn PDF document text
    • http://studiopignotti.it/userfiles/files/jidudapiwasize.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC82 10556 bytes
SHA-256: 1767be951e41e4b86228687d3a523a5bb86deac92da18e3c277f8e139e615c9b
font_01_sfnt_off0000f49c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF49C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010cae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CAE 17156 bytes
SHA-256: ad944c34342d4f442181d23da3df3e8d7f4dbc110e348b583f1f0ae9878ddae5

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